Strong team: YubiKey and Keepass (Linux)

Password managers like Keepass(I pefer KeepassXC)/Lastpass offer a nice choice to manage all your „accounts“ with different user/password strings and with very complex (and long) passwords. If someone gets access on your keepass-database and the password for it – bad luck. Authentication-Hardware like YubiKeys provide more security on your keepass-database and work like a charme on Linux.